Understanding Crank Hub Failure on the BMW S55 Engine
The BMW S55 engine is a powerhouse that has garnered a reputation for delivering thrilling performance and driving pleasure. However, like any complex machinery, it is not without its potential challenges. One issue that has been observed in some S55 engines is crank hub failure. In this blog post, we will delve into the details of crank hub failure on the BMW S55 engine, exploring its causes, symptoms, and potential solutions to help owners and enthusiasts understand and address this concern.
1. Understanding the Crank Hub:
- The crank hub is a critical component of the engine that connects the crankshaft to the accessory drive, such as the water pump and alternator.
- In the S55 engine, the crank hub is responsible for transmitting power and maintaining synchronization between the crankshaft and the various engine components.
2. Causes of Crank Hub Failure:
- The primary cause of crank hub failure on the S55 engine is the potential for the press-fit connection between the crank hub and the crankshaft to slip or become compromised over time.
- High torque loads and aggressive driving can contribute to increased stress on the crank hub, potentially leading to failure.
3. Symptoms of Crank Hub Failure:
- A notable symptom of crank hub failure is a loss of power and engine performance, accompanied by unusual vibrations or noises.
- Engine misfires, rough idling, and difficulties in starting the vehicle may also indicate an issue with the crank hub.
- In some cases, the failure may cause the accessory drive components to stop functioning, leading to cooling or charging system malfunctions.
4. Addressing Crank Hub Failure:
- If you suspect crank hub failure on your S55 engine, it is crucial to seek professional diagnosis and assistance from a qualified BMW technician.
- Replacing the stock crank hub with an upgraded aftermarket solution, such as a solid or keyed design, is a common approach to address this issue and enhance durability.
- Regular maintenance and inspections can help identify potential concerns early on and prevent catastrophic failure.
5. Manufacturer Response and Warranty:
- BMW has recognized the crank hub issue on some S55 engines and has extended the warranty coverage for this specific component in certain models and production years.
- It is important to check with your local BMW dealership or authorized service center to determine if your vehicle is eligible for warranty coverage or any potential recalls related to crank hub failure.
6. Prevention and Maintenance:
- Proactive maintenance, including regular oil changes, monitoring of engine performance, and adherence to recommended service intervals, can contribute to the longevity and reliability of the S55 engine.
- Additionally, modifying driving habits to avoid excessive stress on the engine, such as aggressive launches or prolonged high RPM operation, may help mitigate the risk of crank hub failure.
Crank hub failure on the BMW S55 engine is a known concern that has affected some vehicles. By understanding the causes, symptoms, and potential solutions, owners and enthusiasts can take proactive measures to address this issue and ensure the longevity and performance of their S55-powered vehicles. It is essential to work closely with knowledgeable BMW technicians and stay informed about any warranty coverage or manufacturer updates related to crank hub failure. By staying vigilant and implementing appropriate maintenance and modifications, S55 owners can continue to enjoy the exhilarating performance and driving pleasure that this engine has to offer.